The invention relates to the technical field of preparation of
active carbon materials, in particular to a method for preparing a
biomass porous carbon material through a
coupling activation method and application of the
biomass porous carbon material. The preparation method comprises the following steps: by taking waste
biomass such as cassava peel as a
raw material, performing
fermentation, acid leaching activation, low-temperature
carbonization, alkali activation, ultrasonic acid
pickling and high-temperature
impurity removal to obtain the biomass-derived
porous carbon material, and performing
electron microscope analysis and pore detection on the biomass-derived porous carbon material prepared by the steps. The biomass derived porous
activated carbon material is of a porous
layered structure and has abundant micropores and mesopores; according to the present invention, the electrochemical test experiment detection results show that the biomass derived porous carbon material has excellent
capacitance performance, and when the
current density is 0.5 A / g, the specific
capacity value range is 200-400 F / g; the material also has good stability, the biomass derived porous carbon material is assembled into a symmetric
supercapacitor, and after 10000 circles of stability tests, the
retention rate of the specific
capacitance of the symmetric
supercapacitor can be maintained to be 90% or above.